Heating apparatus.



PATENTED JUNE 27, 1905.

@gimmm J. DBMAREST. HEATING APPARATUS. APPLICATION IiLBD JULY 23. 1904.

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M-s-M UNITED STATES Patented June 27, 1905.

PATENT OFEIcE.

HEATING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 793,569, dated June 27, 1905.

Application filed July 23, 1904. Serial No. 217,778.

To all whmn it may concern.-

Be it known that I, J OIIN DnMAR sT, acitizen of the United States, residing at Bing-hamton, county of Broome, State of New York, have invented an Improvement in Heating Apparatus, of which the following description, in connection with the accompanying drawing, is a specification, like numerals on the drawing representing like parts.

My invention relates to warm-air furnaces, such as are employed in warming buildings; and the aim thereof is to increase the capacity of the furnace for supplying warm air.

Other objects and advantages of the invention will appear from a description of one embodiment thereof illustrated in the accompanying drawing.

The figure shows a front elevation of the furnace, parts being in section.

In the particular form of the invention herein selected for illustration the main body of the furnace, comprising the fire-pot 1, ash-pit 2, and dome 3, may be of any suitable and avell-known construction, and the parts named may be provided, respectively,with the usual fuel-door 4, ash-door 5, and manhole 6. These parts may be mounted, as usual, upon a castiron base-plate or foundation member 7 which is of considerably larger diameter than said main. body to afford a support also for the usual sheet metal sheathing 8, which surrounds the same and forms therewith the annular air-heating chamber 9. Below the baseplate or foundation member 7 is provided a fresh air duct 10, which communicates, by means of a passage 11, with the open air and in furnaces of ordinary construction opens directly and unobstructedly into the heatingchamber 9 through openings in the base-plate 7. In the present construction, however, the heating-chamber is provided, according to my invention, with an air directing and deflecting member, which may be constructed in a variety of forms, but, as here shown, consists of a cylindrical sheet-metal wall 12, located adjacent the main body of the furnace and extending upward between the same and the sheathing 8 from the base-plate 7 to a point just below the dome 3, thereby leaving an annular space 13 between the top of the wall and the dome. 7 afford communication between the air-duet 10 and the annular space formed by the main body of the furnace and the member 12, and said member is provided, preferably, throughout its area with a plurality of apertures 14, by means of which fresh air from the duct 10, after becoming warmed and upon reverberation from the heated surface of the main furnace-body, and before becoming superheated by continued contact throughout the length of said body, may escape into the space between the member 12 and the sheathing 8 and thence pass to the distributing-pipes, which are ordinarily provided in such furnaces, but are not here shown.

In order to assist the escape of the warmed air through the apertures 14, and thereby more effectually prevent continued contact with the furnace-body and the consequent superheating of the air, each of said apertures may be provided with suitable means, such as the deflectors 15, for deflecting'the warmed air toward and out through said apertures. These deflectors may be constructed and arranged in any desired manner; but as here shown they are formed by partially severing portions of the wall 12 and bending the severed portions inward and leaving them inclined at angles of about forty-five degrees toward the furnacebody. In order more elfectually to prevent the superheating of the air, the invention in its more extended aspect contemplates, further, the supplying of air to the annular space within the wall 12 at different levels, so that the air entering at the lower levels when warmed will in its upward path meet other fresh volumes of air, and hence will of necessity seek the larger and less occupied spaces between the wall 12 and the sheathing 8. To this end the invention contemplates providing an annular air-inlet passage 18, preferably formed in conjunction with the sheathing 8 by a sheet-metal partition 19, and communicating with the air-duct 10 by the passages 18 and with the heating-space within the wall 12 by means of a plurality of obliquely-extending pipes 20, preferably located in staggered relation at different levels around and within the heating-chamber, as shown in Openings 17 in the base-plate the drawing. In addition to or in combination with the pipes 20 for delivering fresh air at different levels a plurality of standpipes 21 of different heights may be provided, communicating, by means of openings 22 in the base-plate 7, with the fresh-air duct 10. These'pipes 21 may be of any desired height, but as here shown are constructed in two lengths arranged alternately around the heating-space, the longer pipes delivering, preferably, at a level just below the lowest pipes 20 and the shorter at a level approximately midway between said level and the base 7.

In operation the air entering at the different levels impinges against the heated body of the furnace and after becoming warm is, upon reverberation, deflected by the deflectors 15 into the distributing-passage withoutthe wall 12. Instead of remaining in contact with the heated furnace-body throughout its entire length and becoming overheated, as in the operation of hot-air furnaces of usual construction, the air after acquiring the moderate degree of heat necessary for the healthy warming of a building is immediately deflected from the source of heat into the distributingpipes.

Obviously it is within the scope of this invention to employ both sets of pipes 20 and 21 or to omit either or both sets and still attain the main object above set forth. WVhile the embodiment of the invention here shown and described comprises an ordinary furnacebody provided with a fire-box as the source of heat, it is evident that the air may be heated by any suitable and convenient means such, for instance, as steam-coils and the like-- and many other changes may be effected in the construction and relative" arrangement of the parts Without departing from the spirit of the invention.

I claim- 1. In a heating apparatus the combination with a heating-surface and a sheathing therefor forming an air chamber therewith, of means to conduct volumes of fresh air from the base of said chamber and to supply the same adjacent said surface at intervals vertically, and means to deflect the heated air from said surface at intervals vertically.

2. In a heating apparatus the combination with a heating-surface and a sheathing therefor, said sheathing forming a fresh-air chamber, means to direct currents of air from said chamber against said surface at different levels and means to deflect the heated air from said surface at diflierent levels.

3. In a heating apparatus the combination with a heating-surface and a surrounding airdireeting member closely adjacent thereto, of means to admit currents of air between said surface and member at different levels and means to deflect the heated air from said surface at intervals vertically.

4c. In a heating apparatus the combination with a heating-surface and a sheathing therefor, of a partition forming an annular freshair chamber adjacent said sheathing, means to direct currents of air from said chamber against said surface at different levels, and means to deflect the heated air from said surface at different levels.

5. In a warm-air furnace, the combination with a heating-surface and a sheathing therefor, of means interposed between the two to form a continuous vertical chamber adjacent said surface provided with means to deflect the air adjacent said surface at intervals away from the latter and to form a passage in conjunction with said sheathing for the distribution of said air.

In testimony whereofI have signed my name to this specification in the presence of two sub scribing witnesses.

JOHN DEMAREST.

WVitnesses:

FRED W. MoMAHoN, J. K. INNES. 

